Display Device Pixel Electrode Voltage Compensation
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Solution Overview
Problem
Display devices with varying pixel electrode aperture ratios experience potential changes due to different pixel electrode sizes, leading to display defects like flicker, as the potential of the pixel electrode changes with the gate signal.
Innovation Solution
A display device design featuring first and second pixel electrodes of different areas, with specific conducting voltages applied to each, and a control circuit that ensures a potential difference is maintained across the pixel electrodes, using a common electrode to stabilize the electric field and prevent flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If different aperture ratios are used for different color pixels to improve luminance efficiency, then luminance efficiency is improved, but display defects such as flicker occur due to potential changes in pixel electrodes of different sizes
Solution Approach 1:
The patent applies different conducting voltages to different scanning signal lines based on the aperture ratio of the pixel electrodes they control. Specifically, scanning signal lines connected to pixel electrodes with larger aperture ratios (such as blue and white sub-pixels) receive a first conducting voltage, while scanning signal lines connected to pixel electrodes with smaller aperture ratios (such as red and green sub-pixels) receive a second conducting voltage. This local differentiation compensates for the potential changes caused by different electrode areas, thereby eliminating flicker while maintaining different aperture ratios for luminance efficiency.
2Reliability
If different conducting voltages are applied to scanning signal lines connected to pixel electrodes of different aperture ratios, then display defects are suppressed, but device complexity increases due to multiple voltage levels
Solution Approach 1:
The patent changes the conducting voltage parameter of scanning signal lines based on the aperture ratio characteristics of connected pixel electrodes. The control circuit is configured to output different conducting voltages (first conducting voltage for larger aperture ratios, second conducting voltage for smaller aperture ratios) to different scanning signal lines. This parameter differentiation compensates for the capacitive effects of different electrode areas, suppressing potential changes and display defects while maintaining a relatively simple control architecture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively suppresses display defects by ensuring uniform voltage drops across all pixel electrodes, preventing flicker and maintaining a stable image display.
Implementation Method 1
a potential of an electrode applied from a source/drain line is changed at the same time according to a change in a gate signal when writing video signal voltages to the respective pixels... because a size of pixel electrodes is different depending on the aperture ratio, a change in the potential of the pixel electrode corresponding to a change in the gate signal is also different for each of the pixels
Data Source
AI summary
Pixel electrodes of a display device include plural first pixel electrodes and plural second pixel electrodes which have areas different from each other. Each of plural scanning signal lines is connected with any one of the plural first pixel electrodes and the plural second pixel electrodes through respective transistors. A control circuit applies a first conducting voltage that is a conducting voltage which is applied to the scanning signal lines connected with the first pixel electrodes, and a second conducting voltage that is a conducting voltage which is applied to the scanning signal lines connected with the second pixel electrodes, and different from the first conducting voltage.